844 B. M. S. Watson — On Micropholis Stowi, Huxley, 



side of the articular is covered by tlie suraiigular, which reaches so 

 low down that it very nearly, if not quite, touches the prearticular. 



The angular is a boat-shaped bone forming the lower surface of the 

 jaw and overlapping the suraiigular and prearticular. 



Thedentaryis a long bone extending from the symphysis far back, 

 overlapping the surangular and angular, and towards the front 

 forming the lower edge of the jaw. 



The coronoid is a very large bone on the inner side of the jaw, 

 reaching well forward and running back with a long overlap on to the 

 angular and prearticular ; in all regions it comes right down to the 

 lower edge of the jaw. 



The splenial is a small bone on the inner side of the jaw, which 

 has a symphysis with its fellow, and passes backward, overlapping 

 the coronoid. 



The material does not show whether an epicoronoid was present or 

 not, but if present it must have been small. 



Vertebral column. E.. 51 0« has fourteen vertebrse in a continuous 

 chain behind the skull, which are exposed from the dorsal surface. 

 Another specimen shows the ventral surface. The atlas is shown in 

 R. 510fl!. The neural arch is in two pieces which meet or nearly 

 meet in the middle line. Tliey are large and carry the facets for the 

 exocoipital condyles. Behind and below is a small pleurocentrum, 



Fig. 4. Left scapulo-coracoid of Micropholis. x IJ. Geological Society 



specimen. 



which articulates also with the neural arch of the second vertebra. 

 The specimen cannot be cleaned sufficiently to show the intercentra 

 in this region. 



All the succeeding vertebrae are much alike ; they are tripartite 

 rachitomous vertebrae of very slender build. 



The neural spines are of medium height and the zygapophyses 

 slender and narrow from side to side. The anterior vertebrae have 

 a strong transverse process carried on the pedicel; in succeeding 

 vertebrae this becomes progressively shorter. 



The pleurocentra are very thin plates of bone of which little can 

 be said, and the intercentra are small wedge - shaped pieces of 

 a cylinder bearing a special projection for the articulation of the rib. 



The ribs are sufficiently described by Figs. 1 and 3, the more 

 posterior ribs being similar but more slender. 



The shoulder-girdle is very well shown in a specimen formerly 

 belonging to the Geological Society. The cartilage bones of each 

 side are fused into one mass in which the sutures shown dotted in 

 Fig. 3 are only very doubtfully recognizable. 



